firstresponse
nounUK /ˌfɜːst rɪˈspɒns/
US /ˌfɜːrst rɪˈspɑːns/
The first help someone gives when something goes wrong.
The first response to the fire was a neighbor calling for help.
OTHER MEANINGS
2. The first answer someone gives to a question or message.
Her first response to my email came the next morning.
3. The first action taken to deal with a problem or emergency.
The team's first response was to check that everyone was safe.
4. The first reaction a person has to news or an event.
His first response to the surprise was a big smile.